#!/usr/bin/env python

import pika
import uuid

class FibonacciRpcClient(object):
    def __init__(self):
	self.connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
	self.channel = self.connection.channel()

	result = self.channel.queue_declare(exclusive=True)
	self.callback_queue = result.method.queue
	
	self.channel.basic_consume(self.on_response,no_ack=True,queue=self.callback_queue)

    def on_response(self,ch,method,props,body):
	if self.corr_id == props.correlation_id:
	    self.response = body

    def call(self,n):
	self.response = None
	self.corr_id = str(uuid.uuid4())
	self.channel.basic_publish(exchange='',routing_key='rpc_queue',properties=pika.BasicProperties(reply_to = self.callback_queue,correlation_id=self.corr_id,),body=str(n))

	while self.response is None:
	    self.connection.process_data_events()
	
	return int(self.response)

fibonacci_rpc = FibonacciRpcClient()

print(" [x] Requesting fib(30) ")

response = fibonacci_rpc.call(30)

print(" [.] Got %r" % response)
